Optical Radiation from Integer Quantum Hall States in Dirac Materials

Published

June 30, 2017

Author(s)

Michael Gullans, Jacob M. Taylor, Mohammad Hafezi

Abstract

Quantum Hall systems exhibit topologically protected edge states, which can have a macroscopic spatial extent. Such edge states provide a unique opportunity to study a quantum emitter whose size far exceeds the wavelength of emitted light. To better understand this limit, we theoretically characterize the optical radiation from integer quantum Hall states in two-dimensional Dirac materials. We show that the scattered light from the bulk reflects the spatial profile of the wavefunctions, enabling spatial imaging of the disorder landscape. We find that the radiation from the edge states are characterized by the presence of large multipole moments in the far-field. This multipole ra- diation arises from the transfer of angular momentum from the electrons into the scattered light, enabling the generation of coherent light with high orbital angular momentum.

Citation

Physical Review B

Volume

95

Pub Type

Journals

Download Paper

DOI Link

Keywords

quantum Hall, graphene, topological, orbital angular momentum of light

Citation

Gullans, M. , Taylor, J. and Hafezi, M. (2017), Optical Radiation from Integer Quantum Hall States in Dirac Materials, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.95.235439 (Accessed April 19, 2024)